Platinum-Modified ZnO/Al 2 O 3 for Propane Dehydrogenation: Minimized Platinum Usage and Improved Catalytic Stability

作者：Gang Liu, Liang Zeng, Zhi‐Jian Zhao, Hao Tian, Tengfang Wu, Jinlong Gong · 发表于：ACS Catalysis · 年份：2016 · DOI：10.1021/acscatal.5b02878 · 被引用次数：226 · 研究领域：Catalysis and Oxidation Reactions、Catalytic Processes in Materials Science、Zeolite Catalysis and Synthesis

Compared to metallic platinum and chromium oxide, zinc oxide (ZnO) is an inexpensive and low-toxic alternative for the direct dehydrogenation of propane (PDH). However, besides the limited activity, conventional zinc-based catalysts suffer from serious deactivation, because of ZnO reduction and/or carbon deposition. Considering the high cost of platinum, reducing the amount of platinum in the catalyst is always desirable. This paper describes a catalyst comprising ZnO modified by trace platinum supported on Al 2 O 3, where the Zn 2+ species serve as active sites and platinum acts as a promoter. This catalyst contains less platinum than traditional platinum-based catalysts and is much more stable than conventional ZnO catalyst or commercial chromium-based systems during PDH. It is proposed that ZnO was promoted to a stronger Lewis acid by platinum; thus, easier C–H activation and accelerated H 2 desorption were achieved.